P212121

Why is this blog called P212121?

P212121 is the most common space group in macromolecular crystallography. I have not yet found an explanation of why P212121 has resulted in more deposits than any other space group in the PDB. As you may already know there are a total of 65 possible space groups for macromolecular crystallography. P212121 comprises almost 25 percent of those deposited within the PDB. This strange occurrence inspired the naming of this blog.